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First time grower got some leaves r starting to develoed these grey spots on themm, growing in coco u sing 400 w mh a hesi fertz anyone have any idea as to whats the problem?

yoo, plants r about 5 weeks old 7 plants under 400w mh in coco, using hesi coco fertz got a few fans going. All of my plants have their bottom young leaves turning yellow and drying up, the smallest of my plants has both the bottom and the second bottom yellow and now they have begun to turn...